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Old 07-13-2006, 02:17 PM
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Join Date: Jul 2006
Posts: 5
W201 power window regulator help

Hi All:

1986 190E 2.3 (W201) driver's power window stuck in the up position! I have searched the threads and found a lot of great information on this particular problem, including how to remove the interior door panel. It seems that the problem could be one of several potential issues including a frozen motor, stripped regulator gears, broken slides, mechanism binding at full up position (overshot stop?).

Here's what I have found so far: (BTW - This car has only 10,500 miles and was never driven in bad weather, always garaged, and for all practical purposes is like new.)

1. The window was working fine when the car was stored away last fall. This spring it would not operate when taken out for its first drive.
2. Interior overhead light dims when window switch is operated up or down
3. Removed interior door panel - I measured approximately +9.5 Volts at the two wire terminals on the door (motor wires) when the window switch is activated UP and -9.5 when the switch is pressed DOWN. There is a faint (single) click sound coming from the motor/regulator area when switch is pressed either up or down. I assume that the voltage is low (ie. not 12V) due to the motor load.
4. The entire lift mechanism (large gear, slides, connecting bars, etc.) is extremely tight when I attempt to move any of the parts. I kind of expected it to be just a tiny bit loose.
5. I tried tapping the motor with a hammer (lightly) while operating the switch in the up and down positions with no luck.

At this point I am inclined to think that the mechanism is binding somehow, maybe having gone slightly past its normal stop (up) position. Perhaps it has something to do with the stops mounted on the large gear? (I can see one of them easily)

Any suggestions as to where I go from here would be much appreciated.

Alex
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